Locomotive-headlight.



No. 796,678. PATENTED AUG. 8, 1905. M. A. ROSS. LOCOMTIVE HEADLIGHT.

APPLICATION FILED APB..24.1905.

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MARK A. ROSS, OFVCHICAGC, ILLINOIS.

LQCONIOTIVE-HEADLIGHT.

Specification of Letters Patent.

Patented Aug. 8, 1905.

Application filed April 24, 1905. Serial No. 257,148.

To all w/torn it may concern.-

Be it known that I, MARK A. Ross, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Locomotive-Headlights, of which the following is a speciiication.

My invention relates to improvements in the construction oi' locomotive-headlights of the class more especially in which the illumination is pi'oduced by electric arcs. Such a headlight consists,usually,of a casing' containing a concave reflector behind the electrodes and a glass front mounted in a bezel or hinged door. l

Owingto the construction of the headlights as hitherto provided, much trouble and eX- pense has been caused by the comparatively frequent breaking of the front pane of glass,

due more especially to the direct heat from the electrodes, as well as concentrated reiected heat-rays, all of which tend to produce unequal expansion of the glass.

My object is to overcome the said difHculty by improving' the construction of the forward part of the headlight in a manner to protect the glass from the direct and reflected heat, and I accomplish this object by exposing the inner surface of the pane to the cooling inlinence of an air-current passing across it.

The drawing shows a vertical section of a headlight consisting, broadly stated, oi' the usual body portion A, in which is mounted a reflector B. The reflector is provided with openings a a for the electrodes. (Not shown.) In the front oi' the body portion A is a stationary annular wall Z), having a large opening c, fitted with a wide ring d, fastened about midway between its ends in the wall b, as shown. Beyond the wallthe ringflares somewhat to produce with the wall an annular trough e. C is a i'rusto-conical door-frame which may be hinged at one side oi' the casing A and held by a catch at the opposite side in the usual manner. The frusto-conical frame oi' the door may be somewhat longer than hitherto usually provided and is so mounted upon the body portion as to leave an annular space f or annular series of openings between it and the wall b. The pane of glass D is fastened in the front portion of the door in a common manner to be held with desired iirrn- IIGSS.

In operation air in comparatively large volume enters the opening or openingsf and is reflected by the ring d toward the inner surface of the pane of glass D. The heat of the electric arc generates a natural incoming draft through the lower parts of the openingf, and the air as it enters moves upward near the inner surface of the pane of glass and out at the top of the casing. The large volume of air entering and moving as described tends to absorb heat behind the pane of glass D, thereby tending to maintain the same comparatively cool and free from danger of unequal expansion and contraction. The annular deflector el forms a trough e, as stated, whereby dust, sparks, water, &c., entering the openingf is prevented from entering the interior of the headlight-casing.

Vhat I claim as new, and desire to secure by Letters Patent, is-

l. In a locomotive-headlight, the combination with the body, refiector therein and vent at its upper side, of a frame on the forward part of the said body having a glass front and a draft-opening at the rear portion of the frame, and a deilector adjacent to said opening for directing the airedraft toward said glass front.

2. In a locomotive-headlight, the combination with the body, reflector therein and vent at its upper side, of a frame on the forward part oi' said body having a glass front and a draft-opening at the rear portion of the frame, and an annular trough-shaped deiiector adjacent to said opening for directing air-draft toward said glass front and carrying oul water, &c., entering the draft-opening- 3. In a locomotive-headlight, the combination with the body, reiiector therein and vent at its upper side, of avdoor-frame on the Jforward part of said body having a glass front, the said frame and body being' separated to form a draft-opening between them, and an annular trough-shaped delector mounted in the body adjacent to said opening for directing air-draft toward said glass front, and for carrying o water, Sac., entering said opening.

MARK A. ROSS.

In presence of A. U. THORIEN, J. H. LANDES. 

